Determination of Exciton Diffusion Length by Transient Photoluminescence Quenching and Its Application to Quantum Dot Films

2015 ◽  
Vol 119 (17) ◽  
pp. 9005-9015 ◽  
Author(s):  
Elizabeth M. Y. Lee ◽  
William A. Tisdale
Keyword(s):  
Quantum Dot ◽  
Diffusion Length ◽  
Photoluminescence Quenching ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

scholarly journals Effect of Quencher, Geometry, and Light Out‐Coupling on the Determination of Exciton Diffusion Length in Non‐Fullerene Acceptors

Solar RRL ◽  
2021 ◽  
Author(s):  
Valentina Belova ◽  
Aleksandr Perevedentsev ◽  
Julien Gorenflot ◽  
Catherine S. P. De Castro ◽  
Miquel Casademont-Viñas ◽  
...  
Keyword(s):  
Diffusion Length ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

Peak Force Visible Microscopy for Determination of Exciton Diffusion Length in Organic Photovoltaic Blends

2018 ◽  
Author(s):  
Haomin Wang ◽  
Le Wang ◽  
Yuequn Shang ◽  
Zhijun Ning ◽  
Xiaoji Xu
Keyword(s):  
Diffusion Length ◽  
Spectroscopic Technique ◽  
Peak Force ◽  
Organic Photovoltaic ◽  
Phase Separations ◽  
Blend Films ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Atomic Force

In this article, we developed a new nano spectroscopic technique, peak force visible (PF-vis) microscopy, which is based on the peak force tapping mode in an atomic force microscope to both visualize nanoscale morphology and estimate exciton diffusion lengths of donor domains in organic photovoltaic blends. Nano phase-separations in P3HT:PCBM and TFB:PCBM blend films were clearly revealed by PF-vis microscopy with a high spatial resolution less than 10 nm. A model that correlates PF-vis signal and the exciton diffusion length was also developed to estimate the diffusion lengths of P3HT and TFB to be 2.9±0.3 and 9.0±1.5 nm, respectively. PF-vis microscopy is expected to assist the evaluation of OPV materials, therefore accelerating the pace of innovation of OPVs.

Determination of Singlet Exciton Diffusion Length in Thin Evaporated C60 Films for Photovoltaics

2012 ◽  
Vol 3 (17) ◽  
pp. 2367-2373 ◽  
Author(s):  
Maria C. Fravventura ◽  
Jaehyung Hwang ◽  
John W. A. Suijkerbuijk ◽  
Peter Erk ◽  
Laurens D. A. Siebbeles ◽  
...  
Keyword(s):  
Diffusion Length ◽  
Singlet Exciton ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
C60 Films

Determination of exciton diffusion length from photoconductivity low-temperature spectra

1971 ◽  
Vol 48 (2) ◽  
pp. 473-480 ◽  
Author(s):  
B. V. Novikov ◽  
A. V. Ilinskii ◽  
K. F. Lieder ◽  
N. S. Sokolov
Keyword(s):  
Low Temperature ◽  
Diffusion Length ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Temperature Spectra

Peak Force Visible Microscopy for Determination of Exciton Diffusion Length in Organic Photovoltaic Blends

2018 ◽  
Author(s):  
Haomin Wang ◽  
Le Wang ◽  
Yuequn Shang ◽  
Zhijun Ning ◽  
Xiaoji Xu
Keyword(s):  
Diffusion Length ◽  
Spectroscopic Technique ◽  
Peak Force ◽  
Organic Photovoltaic ◽  
Phase Separations ◽  
Blend Films ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Atomic Force

In this article, we developed a new nano spectroscopic technique, peak force visible (PF-vis) microscopy, which is based on the peak force tapping mode in an atomic force microscope to both visualize nanoscale morphology and estimate exciton diffusion lengths of donor domains in organic photovoltaic blends. Nano phase-separations in P3HT:PCBM and TFB:PCBM blend films were clearly revealed by PF-vis microscopy with a high spatial resolution less than 10 nm. A model that correlates PF-vis signal and the exciton diffusion length was also developed to estimate the diffusion lengths of P3HT and TFB to be 2.9±0.3 and 9.0±1.5 nm, respectively. PF-vis microscopy is expected to assist the evaluation of OPV materials, therefore accelerating the pace of innovation of OPVs.

Determination of axial and lateral exciton diffusion length in GaN by electron energy dependent cathodoluminescence

2016 ◽  
Vol 120 (8) ◽  
pp. 085703 ◽  
Author(s):  
Matthias Hocker ◽  
Pascal Maier ◽  
Lisa Jerg ◽  
Ingo Tischer ◽  
Gregor Neusser ◽  
...  
Keyword(s):  
Electron Energy ◽  
Diffusion Length ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Energy Dependent

Determining the exciton diffusion length of copper phthalocyanine in operating planar-heterojunction organic solar cells

2020 ◽  
Vol 89 (3) ◽  
pp. 30201 ◽  
Author(s):  
Xi Guan ◽  
Shiyu Wang ◽  
Wenxing Liu ◽  
Dashan Qin ◽  
Dayan Ban
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Diffusion Length ◽  
Copper Phthalocyanine ◽  
Short Circuit ◽  
Thick Layer ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

Organic solar cells based on planar copper phthalocyanine (CuPc)/C60 heterojunction have been characterized, in which a 2 nm-thick layer of bathocuproine (BCP) is inserted into the CuPc layer. The thin layer of BCP allows hole current to tunnel it through but blocks the exciton diffusion, thereby altering the steady-state exciton profile in the CuPc zone (zone 1) sandwiched between BCP and C60. The short-circuit current density (JSC) of device is limited by the hole-exciton scattering effect at the BCP/CuPc (zone 1) interface. Based on the variation of JSC with the width of zone 1, the exciton diffusion length of CuPc is deduced to be 12.5–15 nm. The current research provides an easy and helpful method to determine the exciton diffusion lengths of organic electron donors.

Vertically Optimized Phase Separation with Improved Exciton Diffusion Enables High-Efficiency Organic Solar Cells with Thick Active Layers

2021 ◽  
Author(s):  
Yanming Sun ◽  
Yunhao Cai ◽  
Qian Li ◽  
Guanyu Lu ◽  
Hwa Sook Ryu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Active Layer ◽  
Organic Solar Cells ◽  
High Efficiency ◽  
Diffusion Length ◽  
Active Layer Thickness ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Active Layers

Abstract The development of high-performance organic solar cells (OSCs) with thick active layers is of crucial importance for the roll-to-roll printing of large-area solar panels. Unfortunately, increasing the active layer thickness usually results in a significant reduction in efficiency. Herein, we fabricated efficient thick-film OSCs with an active layer consisting of one polymer donor and two non-fullerene acceptors. The two acceptors were found to possess enlarged exciton diffusion length in the mixed phase, which is beneficial to exciton generation and dissociation. Additionally, layer by layer approach was employed to optimize the vertical phase separation. Benefiting from the synergetic effects of enlarged exciton diffusion length and graded vertical phase separation, a record high efficiency of 17.31% (certified value of 16.9%) was obtained for the 300 nm-thick OSC, with an unprecedented short-circuit current density of 28.36 mA cm−2, and a high fill factor of 73.0%. Moreover, the device with an active layer thickness of 500 nm also shows a record efficiency of 15.21%. This work provides new insights into the fabrication of high-efficiency OSCs with thick active layers.

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